Tool for grinding in internal-combustion engine valves



April 29 1947. A. w. PORTER 2,419,728

TOOL FOR GRINDING IN INTERNAL COMBUSTION ENGINE VALVES Filed Aug. 25, 1945 l/v YEW-ar fir/b emey Patented Apr. 29, 1947 TOOL FOR GRINDING IN INTERNAL-COM- BUSTION ENGINE VALVES Arthur William Porter, Plymstock, England Application August 23, 1945, Serial No. 612,158 In Great Britain September 1, 1944 3 Claims.

This invention relates to a new or improved tool to facilitate the grinding in on their seatings of valves of engines. The primary object of this invention is to provide a tool for use with overhead valve internal combustion engines which tool will facilitate the manipulation of the valve on the hand turning thereof during the grinding in operation. A further object is to provide a tool which will enable the operator to apply the necessary pressure to the valve on to its seating by a pullinr and turning action instead of the usual pushing and turning action on the valve head. Another object is to allow the operator to be seated whilst using the tool which results in a quicker operation, as the said operator has more control over the work and is less likely to become fatigued.

The accompanying sheet of drawings illustrates a preferred form of tool in accordance with the invention, and in the drawings:

Fig. 1 is an elevation partly in section of the tool showing the end of the stem secured therein.

Fig. 2 is a plan view of the tool alone, and

Fig. 3 is a side view thereof.

Like reference numerals indicate like parts in the various figures.

The tool is in the form of a clamp and consists of an upper plate l which has a U-shape slot 2 therein. The width across this slot is substantially equal to the internal diameter of the spring of the valve to be ground in and greater than the diameter of the stem of said Valve, whilst the width across the undersurface of the plate I is slightly greater than the diameter of the valve spring holder. A pair of arms 3 extend from each side of said plate thus leaving the mouth of the slot clear, said arms extending downwardly and inwardly as shown, to an internally threaded boss 4. The clamp body described is preferably made of metal by casting, and the boss 4 is disposed in a plane parallel with the plate I and beneath the slot 2 therein as shown in Fig. 2.

A screw threaded bolt 5 engages in the boss 4, and the projecting end of said bolt has a handle 6 which is conveniently of metal rod or tube, welded to the end of the bolt. Any suitable hand turning means such as an apertured head on the bolt and a tommy bar, may be provided. A looking ring 1 is provided around said bolt which has manipulating fingers 8 projecting therefrom.

In use, the valve cotter and spring holder are firstly removed from the valve and the spring removed. The cotter 9 and spring holder H) are then replaced and with the bolt drawn back sufficiently, the end of the valve stem is placed in the slot so that the spring holder is beneath the plate I and the valve projects from the clamp.

The bolt is then screwed up so that its end butts the end of the valve stem with which it is in line. This forces the spring holder against the underside of the plate I thus locking the clamp to the stem. The locking ring 1 is now tightened down on to the boss l.

The valve head which is not shown in the drawings, can be drawn on to its seating by pulling on the handle '6. Grinding in is carried out in the usual manner, the head however, being drawn on to its seating and turned.

I claim:

1. A valve grinding tool comprising a hollow body consisting of an upper plate, a U-shaped slot in said plate, beneath which plate the valve spring holder can bear, arms extending from said plate, an internally screw threaded boss carried by the ends of said arms in a plane paral lel with the plate, and beneath the slot therein a threaded bolt engaging in said boss, to bear on the end of the valve stem, hand turning means carried by said bolt and locking means for retaining the bolt in its tightened position.

2. A valve grinding tool comprising a metal casting which consists of an upper plate having a U-slot therein of'a width enabling the valve stem to pass therein, a pair of arms one extending from each side of the said plate downwardly and inwardly to an internally threaded boss which is disposed in a plane parallel with the said plate and beneath the slot therein, a screw threaded bolt engagin in said boss, a handle on the projecting end of said bolt, and a locking ring on the bolt between said handle and boss.

3. In a valve grinding tool, a clamp comprising a pair of arms, a slotted plate supported between the arms adapted to bear against a valve spring holder, axially adjustable means adapted to engage the end of the valve stem to thereby force the valve spring holder against the under side of the said plate, a handle for said means, and lock means for holding said first-mentioned means in its adjusted position.

ARTHUR WILLIAM PORTER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,065,749 Wall June 24, 1913 1,367,150 Knowles Feb. 1, 1921 1,379,310 OSullivan May 24, 1921 FOREIGN PATENTS Number Country Date 331,574 British July 4, 1930 

